#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2023, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

# clone fe:SOURCE host:remote_system_ds/disk.i size
#   - fe is the front-end hostname
#   - SOURCE is the path of the disk image in the form DS_BASE_PATH/disk
#   - host is the target host to deploy the VM
#   - remote_system_ds is the path for the system datastore in the host

SRC=$1
DST=$2
VM_ID=$3
DS_ID=$4

#--------------------------------------------------------------------------------

if [ -z "${ONE_LOCATION}" ]; then
    TMCOMMON=/var/lib/one/remotes/tm/tm_common.sh
    LIB_LOCATION=/usr/lib/one
else
    TMCOMMON=$ONE_LOCATION/var/remotes/tm/tm_common.sh
    LIB_LOCATION=$ONE_LOCATION/lib
fi

DRIVER_PATH=$(dirname $0)

source $TMCOMMON
source ${DRIVER_PATH}/../../etc/datastore/ceph/ceph.conf

CEPH_UTILS=${DRIVER_PATH}/../../datastore/ceph/ceph_utils.sh

#-------------------------------------------------------------------------------
# Process destination
#-------------------------------------------------------------------------------

DST_HOST=`arg_host $DST`
DISK_ID=$(echo $DST|awk -F. '{print $NF}')

#-------------------------------------------------------------------------------
# Get Image information & destination image
#-------------------------------------------------------------------------------

SRC_PATH=`arg_path $SRC`

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
        XPATH_ELEMENTS[i++]="$element"
done < <(onevm show -x $VM_ID| $XPATH  \
                     /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/CEPH_USER \
                     /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/CEPH_KEY \
                     /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/CEPH_CONF)

CEPH_USER="${XPATH_ELEMENTS[j++]}"
CEPH_KEY="${XPATH_ELEMENTS[j++]}"
CEPH_CONF="${XPATH_ELEMENTS[j++]}"

#-------------------------------------------------------------------------------
# Remove any @snap in image (non persistent -> persistnet)
#-------------------------------------------------------------------------------

if [ -n "$CEPH_USER" ]; then
    RBD="$RBD --id ${CEPH_USER}"
fi

if [ -n "$CEPH_KEY" ]; then
    RBD="$RBD --keyfile ${CEPH_KEY}"
fi

if [ -n "$CEPH_CONF" ]; then
    RBD="$RBD --conf ${CEPH_CONF}"
fi

# snapshot delete is mandatory as it could lead to data loss after
# persitent/nonpersistent image switch

LN_CMD=$(cat <<EOF
    RBD="${RBD}"

    rbd_rm_snap $SRC_PATH
EOF
)

ssh_exec_and_log_stdin "$DST_HOST" "$LN_CMD" "$CEPH_UTILS" \
                 "Error cloning $SRC_PATH to $RBD_DST in $DST_HOST"
exit 0
